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Rajewski BH, Makwana KM, Angera IJ, Geremia DK, Zepeda AR, Hallinan GI, Vidal R, Ghetti B, Serrano AL, Del Valle JR. β-Bracelets: Macrocyclic Cross-β Epitope Mimics Based on a Tau Conformational Strain. J Am Chem Soc 2023; 145:23131-23142. [PMID: 37844142 PMCID: PMC10823581 DOI: 10.1021/jacs.3c06830] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2023]
Abstract
The aggregation of misfolded tau into neurotoxic fibrils is linked to the progression of Alzheimer's disease (AD) and related tauopathies. Disease-associated conformations of filamentous tau are characterized by hydrophobic interactions between side chains on unique and distant β-strand modules within each protomer. Here, we report the design and diversity-oriented synthesis of β-arch peptide macrocycles composed of the aggregation-prone PHF6 hexapeptide of tau and the cross-β module specific to the AD tau fold. Termed "β-bracelets", these proteomimetics assemble in a sequence- and macrocycle-dependent fashion, resulting in amyloid-like fibrils that feature in-register parallel β-sheet structure. Backbone N-amination of a selected β-bracelet affords soluble inhibitors of tau aggregation. We further demonstrate that the N-aminated macrocycles block the prion-like cellular seeding activity of recombinant tau as well as mature fibrils from AD patient extracts. These studies establish β-bracelets as a new class of cross-β epitope mimics and demonstrate their utility in the rational design of molecules targeting amyloid propagation and seeding.
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Affiliation(s)
- Benjamin H. Rajewski
- Department of Chemistry & Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Kamlesh M. Makwana
- Department of Chemistry & Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Isaac J. Angera
- Department of Chemistry & Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Danielle K. Geremia
- Department of Chemistry & Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Anna R. Zepeda
- Department of Chemistry & Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Grace I. Hallinan
- Department of Pathology & Laboratory Medicine and Stark Neurosciences Research Institute, Indiana University School of Medicine, Indianapolis, Indiana, 46202, United States
| | - Ruben Vidal
- Department of Pathology & Laboratory Medicine and Stark Neurosciences Research Institute, Indiana University School of Medicine, Indianapolis, Indiana, 46202, United States
| | - Bernardino Ghetti
- Department of Pathology & Laboratory Medicine and Stark Neurosciences Research Institute, Indiana University School of Medicine, Indianapolis, Indiana, 46202, United States
| | - Arnaldo L. Serrano
- Department of Chemistry & Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Juan R. Del Valle
- Department of Chemistry & Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
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Richaud AD, Roche SP. Structure-Property Relationship Study of N-(Hydroxy)Peptides for the Design of Self-Assembled Parallel β-Sheets. J Org Chem 2020; 85:12329-12342. [PMID: 32881524 DOI: 10.1021/acs.joc.0c01441] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
The design of novel and functional biomimetic foldamers remains a major challenge in creating mimics of native protein structures. Herein, we report the stabilization of a remarkably short β-sheet by incorporating N-(hydroxy)glycine (Hyg) residues into the backbone of peptides. These peptide-peptoid hybrids form unique parallel β-sheet structures by self-assembly upon hydrogenation. Our spectroscopic and crystallographic data suggest that the local conformational perturbations induced by N-(hydroxy)amides are outweighed by a network of strong interstrand hydrogen bonds.
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Affiliation(s)
- Alexis D Richaud
- Department of Chemistry and Biochemistry, Florida Atlantic University, Boca Raton, Florida 33431, United States
| | - Stéphane P Roche
- Department of Chemistry and Biochemistry, Florida Atlantic University, Boca Raton, Florida 33431, United States.,Center for Molecular Biology and Biotechnology, Florida Atlantic University, Jupiter, Florida 33458, United States
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